While that was a problem, the larger one was that the cars were too fast for the tires and safety equipment of the time.

In a 13 month period there were three fatal accidents that were down to drivers losing control and crashing on their own. The last two coming in successive months. The repeated accidents killed off Group B and the nascent Group S that was supposed to replace it.

Modern WRC cars much higher cornering speeds than the Group B cars because of advances in tire technology. They aren’t as fast in a straight line, but they are massively safer in the event of a crash.

Group B absolutely had a cars problem, 3 of the 4 accidents mentioned were not crowd related, there was literally no close witness (only a video from far away) to Toivonen and Cresta's accident.

The Lancias were some of the worst offenders to the cars issue, but not the only one: many drivers complained that the cars had gotten way too powerful to be safe in Corsica.

And safety equipment was lacking and not consistently applied, for instance fuel tank skid plates were usually left off on asphalt tracks like corsica, which is likely how Toivonen's lancia instantly caught fire when it went off the road.